JP2018066152A - Steel pipe fitting device - Google Patents

Abstract

An object of the present invention is to connect steel pipes for piles with good workability. A joint device A for connecting two steel pipes by abutting each other, comprising cylindrical male and female joints 10 and 20, which are fitted and meshed so as to be integrated around an axis thereof. Circumferential grooves 14 and 24 are formed on both opposing surfaces of the male and female joints, respectively, and the engagement pieces 30 (divided pieces 31) equally divided in the grooves are loaded so as to be movable in the radial direction of the male and female joints. To do. When the male and female joints are fitted, the engaging piece is retracted into one groove 24 to allow the fitting, and after fitting, the engaging piece is pushed into the other groove 14 by the coil spring 34 and is inserted into both grooves. It is located across and prevents axial separation of the male and female joints. The split pieces 31 of the engaging pieces are supported by the countersunk screws 41. Immo screws 44 are screwed into the boundary end portions of the respective split pieces to press the adjacent split pieces against the groove bottom surface, and the engaging pieces are firmly fixed in the grooves. Thus, the vertical direction of the male-female joint is firmly integrated. [Selection] Figure 4

Description

  The present invention relates to a steel pipe joint device, for example, a steel pipe joint device such as a steel pipe pile used for pile foundation work.

  For example, as shown in FIG. 15, when the steel pipes 1a and 1b to be piled are rotated and embedded in the ground, the construction is temporarily stopped in the middle of the press-fitting in order to reach a predetermined depth. Connections 1a and 1b are made. On-site welding is performed as a means of connecting the steel pipe. However, since the welding requires a high level of skill and is affected by the weather, a non-welded type steel pipe joint device is used on site. It has been proposed (Patent Documents 1 to 4).

  The steel pipe joint device is usually composed of a pair of cylindrical male and female joints 10 and 20, and at the factory, one joint (for example, a male joint) is welded to one end of the steel pipe on the same axis, and the other A joint (for example, female joint) is welded to the other end of the steel pipe on the same axis, and at the construction site, the male and female joints are joined to connect the two steel pipes 1a and 1b.

As an example of the steel pipe joint device composed of this pair of male and female joints, there is one in which a pair of male and female joints are spline-bonded, and both the joints thus coupled are bolted. At this time, there are also ones in which circumferential grooves are formed on both opposing surfaces of the male and female joints, and stoppers that span the grooves are fitted into the grooves, and the stoppers are bolted (Patent Documents 1 and 2). Etc.). The stopper is composed of a ring-shaped member whose diameter can be freely changed, and the ring-shaped member is expanded or contracted by screwing in a bolt so as to extend over both grooves, or retreat into one groove (Patent Document 2). (See claim 1, drawings, etc.).
As another example, there is also a steel pipe joint device in which a pair of male and female joints are fitted and meshed in the vertical direction, and a lock pin crossing both opposing surfaces of the male and female joints is screwed (Patent Document 3). Reference examples 1 and 2 showing the usage state).
Furthermore, there is a steel pipe joint device in which a pair of male and female joints are meshed and joined in the vertical direction, and a connecting member is applied to the outer periphery of the meshed portion so as to be bolted (see Patent Document 4, Abstract, FIGS. 1 to 4, etc.). ).

JP 2001-241038 A Japanese Patent Laid-Open No. 11-36286 Design Registration No. 1463516 JP2013-40537A JP 2014-74468 A

Each steel pipe joint device is effective as it is. However, in the case where the male and female joints are integrated by screw tightening, the integrated strength depends on the tightening degree, and in order to obtain effective strength. Skill is necessary. Further, if there is a member protruding from the outer peripheral surface of the steel pipe on the outer surface of the joint device, it becomes a resistance during press fitting. For this reason, there exists a possibility that the connection member of patent document 4 may become the resistance.
Furthermore, as shown in FIG. 15, in the case of construction on the platform F of the station, there is a structure such as an existing roof R, and it is impossible to take high above the sky, and movement of the soil when excavating around the piles 1 a and 1 b It is difficult to carry out due to the complexity of carrying out and backfilling, and the restriction of short-term construction from the last train to the first train. In this case, it is difficult to form a large pit P, and it is necessary to make the pit P as small as possible, and the connection work of the piles 1a and 1b is performed in the small pit P. For this reason, the rotation operation of the bolts and the like is complicated, and it is desirable to make the work in the pit P as simple as possible.

  This invention makes it a subject to connect a male-female joint by one touch in view of the above actual condition.

In order to achieve the above-mentioned object, the present invention loads an engaging piece between both opposing surfaces of the male and female joints, and when the male and female joints are fitted together, the engaging piece is disengaged and fitted. The mating is allowed, and after the male and female joints are fitted, the engaging pieces are easily positioned between the male and female joints to prevent the axial separation of both joints.
By doing so, the male and female joints are allowed to be fitted and separated from each other by the engagement piece, so that it can be said to be a one-touch connection joint device.

  As a specific configuration of the present invention, a steel pipe joint device for connecting two steel pipes by abutting at their edges, comprising a pair of cylindrical male and female joints welded to the steel pipes, respectively, The joints fit together in the cylinder axis direction and are united around the shaft center by meshing, forming circumferential grooves facing each other in the radial direction of the male and female joints on both opposed peripheral surfaces of the male and female joints. The engagement pieces are movably loaded in the circumferential direction of the male and female joints in both circumferential grooves, and a through hole that leads from the outer surface to the circumferential groove is formed in the joint that is fitted and meshed with each other, The push rod is movably penetrated through the through hole, and the tip is fixed to the engagement piece. When the male and female joints are fitted, the engagement piece is pulled out of the push rod and the peripheral groove on the outer joint side. After leaving and allowing the fitting, after the male and female joints are fitted The push rod is pushed into the other circumferential groove by being pushed in, and is positioned across both circumferential grooves to prevent the male and female joints from separating in the axial direction, and the head portion of the push rod is submerged in the through hole. It was.

In this configuration, “moving through the through hole into the through hole movably” does not include screwing or the like, and by pushing or pulling the push bar in the axial direction, the inside of the through hole is pushed. It is intended to move, the push rod is pulled out, the locking piece is withdrawn into the circumferential groove of the outer joint, and in this state, both the joints are fitted together to connect the upper and lower steel pipes. In this state, integration around the axis of the steel pipe connected by the engagement of the male and female joints is ensured. After that, the push rod is pushed in and the locking piece is moved toward the circumferential groove of the inner joint so that the position extends over both circumferential grooves. In this state, the vertical integration of the steel pipes connected by fitting the engaging pieces into both circumferential grooves of the male and female joints is ensured.
At this time, if at least one of the abutting edges of the male joint and the engaging piece is chamfered, the engaging piece is pushed by the insertion end of the male joint as the male and female joints are fitted into the circumferential groove. In order to enter, the fitting is performed smoothly. Further, if the push rod is submerged in the through hole, it can be confirmed by visual observation that the male and female joints are firmly integrated in the vertical direction by the engagement piece. If the push rod is not submerged in the through-hole, the head portion of the push rod is struck and submerged with a hammer or the like, and the male and female joints are integrated in the vertical direction by the engagement piece.

Various means such as screwing, welding, and adhesion can be used to fix the tip of the pressing rod to the engaging piece. For pushing and pulling out the push rod, various tools may be used. For example, a hammer, pliers or the like is used. At this time, if the head of the push rod is provided with a hook locking portion for the extraction tool, if the pull tool is hooked on the locking portion and the push rod is pulled, the engaging piece is also pulled and the outer joint Can be stored in the circumferential groove. For this reason, the male joint can be pulled out from the female joint, and the upper and lower steel pipes can be removed.
Thus, since the engaging piece can be moved in the circumferential groove by pushing or pulling out the push rod, the operation is simple, and the operation is easy even in the small pit P.

  In the above configuration, if a spring is provided between the outer surface of the engagement piece and the inner surface of the circumferential groove of the joint located on the outer side where the engagement piece is engaged and engaged, the spring presses the engagement piece toward the inner joint side. When the female and male joints are fitted, the spring expands and contracts, and when the male and female joints are engaged, the engaging piece is inserted into the outer joint side circumferential groove by pulling out the push rod against the spring. After retreating and allowing the fitting, and the male and female joints are fitted together, they are pushed into the other circumferential groove by the biasing force of the spring and positioned over both circumferential grooves, and the axial direction of the male and female joints Prevent separation.

Any number of the engagement pieces may be provided in the circumferential direction as long as the vertical integration of the male and female joints can be ensured, and at that time, equal intervals are preferable. The circumferential groove has an arbitrary cross-sectional shape such as round, oval, quadrilateral, etc., but the radial direction of the male and female joints is the same shape and the bottom surface so that the engaging piece can move smoothly in both circumferential grooves. It is preferable to make it reach. When the engagement piece is divided, it goes without saying that a spring and a push rod are provided for each divided engagement piece.
If the engagement pieces are loaded over the entire circumference of the male and female joints, the male and female joints can be prevented from separating in the axial direction over the entire circumference, so that the integrated strength of the male and female joints is improved. . At this time, if the engaging piece is divided, there is an advantage that it can be easily loaded into the groove.
If a screw is screwed into the boundary end portion of each of the above-mentioned divided engagement pieces from the outer surface of the outer joint so that the adjacent divided engagement piece is pressed against the inner circumferential groove of the inner joint, each divided engagement piece Since the piece is stable in the groove, the integrated strength of the male-female joint is also improved.

Further, the engaging piece can be constituted by a split ring that can be reduced in diameter and fits in a circumferential groove of a joint located on the outside.
This type of ring is well known as a lock ring for a pipe joint (see Fig. 2 of Patent Document 5, etc.). If the ring is set (loaded) in the peripheral groove of the outer joint before fitting the male and female joints, Then, the ring is expanded and retracted into the circumferential groove to allow the fitting, and after the male and female joints are fitted, the ring is positioned over both the circumferential grooves of the male and female joints by the return force of its tightness. To do.

  Since this invention was comprised as mentioned above, a steel pipe can be connected with sufficient workability | operativity.

Partially cutaway front view of a state in which steel pipes are connected by an embodiment of a steel pipe joint device according to the present invention Perspective view of the same embodiment Front view of the same embodiment Cutting plan view of the same embodiment The perspective view of the state which separated the male-female joint of the embodiment The exploded perspective view of the male-female joint of the embodiment Partial perspective view for explaining engagement piece attachment to the female joint of the same embodiment Plan view of the male joint of the same embodiment Front view of the male fitting Bottom view of same male joint The cut-away view of the same male joint is shown, (a) is the II line | wire of FIG. 6A, (b) is the II-II line | wire. Plan view of the female joint of the same embodiment Front view of the female joint Bottom view of the female joint The cutaway view of the female joint is shown, (a) is the II line of FIG. 7A, (b) is the II-II line, (c) is the III-III line. Sectional view taken along line IV-IV in FIG. 7B of the female joint Cross-sectional view for explaining the operation of the embodiment Cross-sectional view for explaining the operation Cross-sectional view for explaining the operation Sectional view taken along the line II of FIG. 8B Illustration of strength test The engagement piece (ring) of other embodiment is shown, (a) is a front view, (b) is the II sectional view taken on the line of (a) of an example, (c) is the sectional view of the other example. FIG. 11B illustrates an example of the operation illustrated in FIG. Other embodiment is shown, (a) is a principal part perspective view, (b), (c) is principal part sectional drawing for an effect | action description. Action explanatory diagram of the same embodiment Cross section for explaining pile driving action at station platform

  One embodiment of the steel pipe joint device according to the present invention is shown in FIGS. 1 to 9, and the steel pipe joint device A of this embodiment also includes a pair of cylindrical male joint 10 and cylindrical female joint 20. The steel pipes 1a and 1b (general symbol: 1) are JIS G 3444 general structural carbon steel pipes (STK) and steel pipe piles (SKK) specified in JIS A 5525. Both joints 10 and 20 are attached to the steel pipe 1. Made of weldable metal. Usually, a steel pipe pile employs an outer diameter of 165.2 mm or more. The fitting length of the male / female joints 10 and 20 may be appropriately set in consideration of the connection strength. For example, when the joint outer diameter is about 270 mm, the fitting length is about 90 mm.

As shown in FIGS. 3 and 6A to 6D, the male joint 10 has the upper edge 11 missing (cut) over the entire circumference, and the outer peripheral surface thereof is substantially the same as the inner diameter of the steel pipe 1. It fits into one end of (1b) and is integrated into the steel pipe 1 by welding a (see FIG. 1). At this time, the outer peripheral surface of the steel pipe 1 and the outer peripheral surface of the male joint 10 are flush with each other, and there is almost no protrusion at the connection portion.
On the outer peripheral surface of the male joint 10 below the upper edge 11, recesses 12 that open downward are formed at equal intervals around the recesses 12, and between the recesses 12 become protrusions (toothed portions) 13, and the protrusions 13. The back surface side is hollow (see FIG. 8A). The number of the concave portions 12 (the convex portions 13) is arbitrary, and the interval may not be equal. In short, it is sufficient that the meshing force capable of transmitting the rotational force to the connected steel pipes 1 and 1 is secured. Only one side of the fitting portion may be chamfered.

  A groove (circular groove) 14 having a square cross section over the entire circumference is formed in the middle of the outer peripheral surface below the male joint 10 in which the concave portion 12 and the convex portion 13 are formed. The edge 15 is C-cut (chamfered) over its entire circumference. The position of the groove 14 in the cylinder axis direction is appropriately set by experiments or the like in consideration of the connection strength.

As shown in FIG. 3 and FIGS. 7A to 7E, the female joint 20 is formed with recesses 22 that open upward at the entire circumference of the upper part at equal intervals around the recesses 22. ) 23. The number, interval, size, and depth of the concave portions 22 and the convex portions 23 correspond to the convex portions 13 and the concave portions 12 of the male joint 10, and the convex portions 13 of the male joint 10 become the concave portions 22 of the female joint 20. The convex portions 23 are fitted into the concave portions 12, respectively, and are integrated around the axis by meshing (see FIG. 2A). The outer peripheral surfaces of the fitted and engaged male and female joints 10 and 20 are flush with each other and are substantially free of protrusions.
The lower edge 21 of the female joint 20 is also missing (cut) over the entire circumference so that its outer peripheral surface is substantially the same as the inner diameter of the steel pipe 1 and is fitted to one end of the steel pipe 1 (1a) and welded to the steel pipe 1 (See FIG. 1). At this time, like the male joint 10, the outer peripheral surface of the steel pipe 1 and the outer peripheral surface of the female joint 20 are flush with each other so that there is almost no protrusion at the connection portion.

A groove (circumferential groove) 24 having a square cross section is formed over the entire circumference in the middle of the inner surface of the female joint 20 in the axial direction. When the male joint 10 is fitted into the female joint 20 and both 10 and 20 are integrated. The groove 24 corresponds to (opposes to) the groove 14 of the male joint 10 and forms a single groove having substantially no step (FIGS. 1, 2A, and 8C). The position of the groove 24 in the cylinder axis direction is also set as appropriate through experiments and the like in consideration of the connection strength.
A joint (lock ring) 30 having a square section serving as an engaging piece is fitted into the groove 24 and the groove 14.
The joint 30 has an annular shape and is composed of a divided piece (divided engagement piece piece) 31 obtained by dividing a steel ring whose inner diameter is the same as the bottom inner diameter of the groove 14 of the male joint 10 (see FIG. 4). For this reason, when a circumferential force is applied by being pushed radially inward by a spring or the like, the divided pieces 31 are stretched to maintain an annular shape. The division | segmentation number of the division | segmentation piece 31 is arbitrary, and an equal space | interval is preferable.

As shown in FIG. 4, the inner peripheral edge of the divided piece 31 is C-cut (chamfered) 31 a, and a screw hole 32 is formed in the middle of the length direction (arc-shaped direction). A countersunk screw 41 serving as a push rod from the outer surface of the joint 20 is screwed through the through hole 42, and the split piece 31 is supported by the female joint 20 in a suspended state by the countersunk screw 41.
Further, a hole 33 that does not open on the inner surface is formed at equal distances on both sides of the screw hole 32 of the split piece 31, and a coil spring 34 is loaded in the hole 33. When the split piece 31 is fitted in the groove 24 with the coil spring 34 loaded, and the split piece 31 is pulled with the flat head screw 41 (when pulled out of the female joint 20), the split piece 31 resists the coil spring 34 and is grooved. It dies in 24. The inner surface of the submerged piece 31 and the inner peripheral surface of the female joint 20 are substantially flush or submerged. As the coil spring 34, an arcuate leaf spring or the like can be adopted as long as it presses the divided piece 31. In the case of a leaf spring, a concave portion for accommodating the leaf spring is formed on the surface of the split piece 31. The leaf spring may be a single one, but a pair of arc-shaped springs facing the recesses may be used. If the receiving hole of the coil spring 34 or a leaf | plate spring is formed in the bottom face (back surface) of the groove | channel 24, the positioning of the spring will be stabilized.

  A screw hole 43 extending from the outer peripheral surface to the inside of the groove 24 is formed in the portion of the female joint 20 corresponding to the boundary of each divided piece 31. A screw (screw) is screwed in and both opposing ends of the adjacent divided pieces 31 are pressed.

  The steel pipe joint device A of this embodiment has the above-described configuration. In the factory, the male joint 10 is attached to one end 1b (for example, the lower end) of the connecting steel pipe 1 by welding a, and the other end 1a (the same upper end). The female joint 20 is attached by welding a. In addition, the excavator which has an auger drill, a bit, etc. is attached to the tip of the steel pipe pile used as the front-end | tip of a pile, and the drive device for driving fits the female joint 20, and gives the rotational force and excavation force to the steel pipe 1. Things are used.

  As shown in FIG. 5, the female joint 20 is configured such that the split piece 31 is fitted into the groove 24 with the coil spring 34 inserted into the holes 33 on both sides thereof, and the flat head screw 41 is passed through the hole 42 to the screw hole 32 of the split piece 31. The divided piece 31 is supported by screwing. The division pieces 31 are supported over the entire circumference of the groove 24, and a joint (engaging piece) 30 is loaded on the entire circumference of the groove 24. The support state of the joint 30 (divided piece 31) is such that the divided piece 31 can move and sink in the groove 24 against the coil spring 34.

For this reason, when the next steel pipe 1b is added to the driven steel pipe 1a, when the male joint 10 at the end of the next (following) steel pipe 1b is fitted into the female joint 20 at the end of the preceding steel pipe 1a, FIG. As shown in FIG. 8B → FIG. 8C, as the male joint 10 is fitted, the joint 30 (each divided piece 31) is retracted (submerged) into the groove 24 to allow the male joint 10 to be fitted. (FIG. 8B). At this time, the segment 31 is pushed into the circumferential groove 24 by the C-cut 15 at the lower end of the male joint 10 and the C-cut 31a at the inner upper periphery of the segment 31 and the male joint 10 is fitted. The fitting is also smooth. The C-cut 15 at the lower end of the male joint 10 and the C-cut 31a at the inner upper periphery of the split piece 31 may be formed in at least one, that is, either the outer peripheral edge at the lower end of the male joint 10 or the inner upper periphery of the split piece 31. Or can be formed on both.
When the male joint 10 is pushed in and the groove 14 of the male joint 10 corresponds to (opposite) the groove 24 of the female joint 20, the joint 30 (each divided piece 31) is moved into the groove 14 of the male joint 10 by the biasing force of the coil spring 34. Fit into. In this fitted state, each divided piece 31 is fitted tightly over both the grooves 14 and 24 of the male and female joints 10 and 20 (FIG. 8C), and the vertical separation of the male and female joints 10 and 20 is prevented. .

  At this time, the countersunk screw 41 is submerged in the through hole 42 (the top surface of the head of the countersunk screw 41 is on the outer peripheral surface of the female joint 20 or on the inner side of the female joint 20). It can be confirmed that the male and female joints 10 and 20 are integrated in the vertical direction. If the countersunk screw 41 is not submerged in the through hole 42, the head of the countersunk screw 41 is struck and submerged with a hammer or the like, and the male and female joints 10 and 20 are integrated in the vertical direction by the joint 30. And In this way, if all the countersunk screws 41 are submerged in each through hole 42, it is confirmed by visual observation that the male and female joints 10 and 20 are firmly integrated by the joint 30 in the vertical direction. it can.

Further, in the state where the male and female joints 10 and 20 are fitted, the concave portions 12 and 22 and the convex portions 13 and 23 of the male and female joints 10 and 20 are perfectly fitted as shown in FIGS. 2A to 2C.
Further, the female screw 44 is screwed into the screw hole 43 of the female joint 20 to press both opposing ends of the adjacent divided pieces 31. By this pressing, each divided piece 31 is pressed against the bottom surface of the groove 14 of the male joint 10, the joint 30 is firmly fixed in the grooves 14 and 24, and the vertical directions of the male and female joints 10 and 20 are firmly integrated.

  With the above operation, as shown in FIG. 1, the steel pipes 1a and 1b connected by the male and female joints 10 and 20 are integrated in the rotation direction and the vertical direction (separation direction). In this state, press-fitting from the upper steel pipe 1b is started. Thereafter, a similar number of steel pipes 1 are added by the same action, and a steel pipe pile having a required length is driven (press-fitted).

A steel pipe 1 having a diameter of 267.4 mm was connected by this steel pipe joint device A shown in FIG. 1, and a simple beam bending test by two-point support and two-point loading was performed as shown in FIG. It was confirmed that it could withstand. In the figure, P is a load, p1, p2, and p3 are displacement measurement points, and the dimensional unit is mm.
Moreover, when the steel pipe joint apparatus shown by patent document 4 was employ | adopted for the connection of the steel pipe 1 of the same diameter and the same strength, and the same test was done, when the same load is carried out, this steel pipe joint apparatus A is each displacement. The displacement at the measurement location was small.
This test result shows that the steel pipe joint device A of this embodiment has a high male / female joint 10, 20 due to the coupling by the engagement of the concavo-convex parts 12, 13, 22, 23 and the firm fitting into the grooves 14, 24 of the joint 30. This is considered to be due to being connected (connected) with rigidity.

  When the steel pipe pile driven into the ground is pulled out, each steel pipe 1 is pulled out to the ground by reversing the pile, etc. In the steel pipe joint device A of each steel pipe 1, 1, the potato screw 44 is removed, and the countersunk screw 41 is replaced with a coil spring. 34, the drawer split piece 31 is retracted into the groove 24 of the female joint 20 and retracted from the groove 14 of the male joint 10 so that both the joints 10 and 20 can be detached, and in this state, the lower steel pipe This is done by pulling the upper steel pipe 1b away from 1a.

In the state where each divided piece 31 is fitted to the entire circumference of the groove 24 of the female joint 20 of FIG. 8A of the above embodiment, each divided piece 31 is formed into an annular shape (see FIG. 4), and the end faces of the divided pieces 31 mutually. It can be stretched (as a bridge) to prevent it from coming out of the groove 24. At this time, the female screw 44 can constitute the pressing means of the split piece 31, and the coil spring 34 can be omitted. The female screw 44 can press the central portion in the length direction of the split piece 31.
Further, the meshing structure of the concave portions 12 and 22 and the convex portions 13 and 23 may be formed on the inner surface of the cylindrical male-female joint. However, the rotational torque transmission efficiency is better when formed on the outer peripheral surface as in the embodiment.

  In the above-described embodiment, the grooves 14 and 24 are not formed on the entire circumference of the male and female joints 10 and 20 and may be intermittent around the periphery. In this case, the divided piece 31 also corresponds to the size of the divided grooves. .

Further, in this steel pipe joint device A, the split ring 50 shown in FIG. 11 is fitted in both the grooves 14 and 24, and the ring 50 is expanded or contracted to fit the male joint 10 to the female joint 20. Can be. In this case, a pressing means such as a spring is not necessary.
The ring 50 has a circular shape having an opening 52 at one circumferential direction, and is fitted into the groove 24 of the female joint 20 as shown in FIGS. , 20 is expanded to enter into the groove 24, and eventually, due to the self-tightening return force (restoring force), the groove 14 and 24 are completely inserted into the groove 14 and the joints 10 and 20 are vertically moved. Is integrated. On the other hand, as shown in FIG. 13 (a) to FIG. 13 (b), in the state of being fitted into the groove 14 of the male joint 10, the diameter is reduced into the groove 14 according to the fitting of the male and female joints 10 and 20, and eventually, With the return force of the opening hand, the grooves 24 and 24 are perfectly inserted into the grooves 24 and the vertical directions of the joints 10 and 20 are integrated.

  In this embodiment, the ring 50 is connected to the male and female joints 10 and 20 by visually observing a state in which the push rod (counter screw) 41 provided in the ring 50 is submerged in the through hole 42 (FIG. 12B). It can be fitted over the circumferential grooves 14 and 24, and the integration of the joints 10 and 20 in the vertical direction can be confirmed. On the other hand, by pulling out the push rod 41, the ring 50 can be accommodated in the circumferential groove 24 of the female joint 20 and the male joint 10 can be pulled apart.

  In these, as long as the male and female joints 10 and 20 can be kept integrated, the ring 50 does not have to fit into the grooves 14 and 24. In addition, an elastic body made of rubber, a spring, or the like is filled in the rear space (groove bottom side space) s of the groove 24 in which the ring 50 is fitted in advance, and the groove in a state where both the joints 10 and 20 are fitted together. Stabilization can be achieved by centering the rings 50 in the 14 and 24. The centering may be performed by a screw (pressing bar 41) extending from the outer peripheral surface of the female joint 20 to the groove 24. The screws are provided at regular intervals around the periphery.

As long as the push rod is a rod-like body that can push and pull the joint 30 and the ring 50 in addition to the flat head screw 41, the mode thereof is arbitrary. For example, as shown in FIG. The pin 60 may be included. The pin 60 is fixed to the joint 30 (engagement piece 31) or the ring 50 by welding, bonding, screwing or the like. As shown in FIG. 4B, the pin 60 has a head portion that forms an annular engagement portion 61 in the through hole 42 when the joint 30 and the ring 50 are fitted over the circumferential grooves 14 and 24. Try to die.
As shown in FIG. 14, the pin 60 having the locking portion 61 can be pulled by hooking the head 61 with a pulling tool 63 having a hook.

In addition, spline coupling is also included in the above engagement, and the above embodiment was a case of a press-fit type steel pipe pile, but this invention is applicable to various pile steel pipes such as a striking type steel pipe pile and an excavation type steel pipe pile. Of course, it can be used for connection.
In the above embodiments, the female joint 20 is welded to the lower (leading) steel pipe 1a and the male joint 10 is welded to the upper (following) steel pipe 1b. The male joint 10 can be welded to the lower (preceding) steel pipe 1b.
Furthermore, the present invention is not limited to steel pipe piles, and can be employed as various steel pipe joints.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

A Steel pipe joint device 10 Male joint 11 of the steel pipe joint device Upper edge 12 of the same male joint Recess 13 of the same male joint 14 Convex part 14 of the same male joint Groove (circumferential groove) of the same male joint
15 Lower edge 20 of the male joint 20 Female joint 21 of the steel pipe joint device Lower edge 22 of the female joint Recess 23 of the female joint 23 Convex part 24 of the female joint Groove (circumferential groove) of the female joint
30 Engagement piece (joint)
31 Split piece 32 of engagement piece Screw hole 33 of split piece Spring hole 34 of split piece Coil spring 41 Countersunk screw
44 Female screw 50 Split ring (engagement piece)
60 pins
61 Pin locking part 63 Extraction tool

As a specific configuration of the present invention, a steel pipe joint device for connecting two steel pipes by abutting at their edges, comprising a pair of cylindrical male and female joints welded to the steel pipes, respectively, The joints fit together in the cylinder axis direction and are united around the shaft center by meshing, forming circumferential grooves facing each other in the radial direction of the male and female joints on both opposed peripheral surfaces of the male and female joints. A through-hole that leads to the circumferential groove from the outer surface of one of the male and female joints that are fitted and meshed with each other so that the engaging pieces are movably loaded in the radial direction of the male and female joints. The push rod is movably penetrated through the through hole, and the tip is fixed to the engagement piece. When the male and female joints are fitted, the engagement piece is pulled out of the outer side by pulling out the push rod. vacated on the joint side of the circumferential groove to allow the interdigitated its male and female fittings After each other fitted, with blocking away in the axial direction of the male and female joints located across the pushing of the push rod is pushed into the circumferential groove of the other joint on both circumferential groove, the head of the push rod is The structure is submerged in the through hole.

Claims (6)

A steel pipe joint device (A) for connecting two steel pipes (1a, 1b) by abutting at their edges,
It consists of a pair of cylindrical male and female joints (10, 20) welded to the steel pipes (1a, 1b), respectively. The male and female joints (10, 20) are fitted in the direction of the cylinder axis, and the shafts are engaged by meshing. Unite around the heart,
Circumferential grooves (14, 24) opposed to each other in the radial direction of the male / female joint (10, 20) are formed on both opposed peripheral surfaces of the male / female joint (10, 20), and both opposed circumferential grooves are formed. (14, 24) is loaded with an engagement piece (30) movably in the radial direction of the male and female joints (10, 20),
A through hole (42) communicating from the outer surface to the circumferential groove (24) is formed in the joint (20) located outside the male and female joints (10, 20) that are fitted and meshed, and the through hole (42) The push rod (41, 60) is movably passed through and the tip is fixed to the engagement piece (30),
When the male and female joints (10, 20) are fitted, the engaging piece (30) is pulled into the circumferential groove (24) on the outer joint (20) side by pulling out the push rod (41, 60). After leaving and allowing the fitting, and the male and female joints (10, 20) are fitted together, the push rod (41, 60) is pushed into the other circumferential groove (14) and pushed into both sides. Positioned across the grooves (14, 24) to prevent the male and female joints (10, 20) from separating in the axial direction, the heads of the push rods (41, 60) are submerged in the through holes (42). A steel pipe joint device.   The steel pipe joint device according to claim 1, wherein at least one of the abutting edges of the male joint (10) and the engagement piece (30) is chamfered (15, 31a).   The heads of the push rods (41, 60) are hooked and locked by a pulling tool (63) from the outside of the joint (20) located outside the male and female joints (10, 20) fitted and meshed. 61) The steel pipe joint device according to claim 1 or 2, characterized by comprising:   A spring that presses the engagement piece (30) toward the inner joint (10) side between the outer surface of the engagement piece (30) and the inner surface of the circumferential groove (24) of the outer joint (20). The steel pipe joint device according to any one of claims 1 to 3, wherein (34) is provided.   The engaging piece (30) is positioned over the entire circumference of the male / female joint (10, 20) and divided in the circumferential direction, and corresponds to each of the divided engaging piece pieces (31). The steel pipe joint device according to any one of claims 1 to 4, wherein the through hole (42) and the push rod (41, 60) are provided.   Screw the screw (44) from the outer surface of the outer joint (20) to the boundary end portion of each of the divided engagement piece pieces (31) so that the adjacent divided engagement piece piece (31) is a circumferential groove of the inner joint (10). (14) The steel pipe joint device according to claim 5, wherein the steel pipe joint device is pressed against the inner surface.

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